CN115268094B - Optical module and laser module - Google Patents
Optical module and laser module Download PDFInfo
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- CN115268094B CN115268094B CN202210951090.7A CN202210951090A CN115268094B CN 115268094 B CN115268094 B CN 115268094B CN 202210951090 A CN202210951090 A CN 202210951090A CN 115268094 B CN115268094 B CN 115268094B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
- G02B27/0961—Lens arrays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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Abstract
The invention provides an optical module and a laser module, which belong to the technical field of light spot superposition, and comprise an array lens group and a wedge-shaped lens group which are sequentially arranged along a main optical axis, wherein the array lens group comprises a first array lens and a second array lens which are sequentially arranged along a first direction perpendicular to the main optical axis, the wedge-shaped lens group is arranged on the light emitting side of the first array lens and/or the second array lens, laser beams output angle space flat-top light spots with the same divergence angle through the array lens group, and the angle space flat-top light spots form superimposed light spots in an angle space in a far field after being refracted through the wedge-shaped lens group. Through setting up array lens group and wedge mirror group to according to array lens group and the different change combination of wedge mirror group, can form the superimposed facula of different effects, the facula form is diversified, and the flexibility is high, can adapt to different demands, through above-mentioned three optical element, realizes that different facula superposes, optical module compact structure, small in size, with low costs, and the restriction to the light source is few.
Description
The application is based on the application number 202010876460.6, the application date is the month 8 and the day 27 of 2020, and the application is a divisional application of the invention named as an optical module and a laser module of the Western An torch optical technology and technology Co., ltd.
Technical Field
The invention relates to the technical field of facula superposition, in particular to an optical module and a laser module.
Background
Currently, when a laser radar (Lidar) applies superimposed light spots, the implementation is mainly achieved in two ways: one is realized by a diffraction element (DOE), such as the one disclosed in patent 201811051292.6, and its use in a lidar system, which generates a diffraction pattern that DOEs not interfere with each other in the far field as a total diffraction pattern when irradiated independently of each other with incoherent laser light. The other is to irradiate the light source at different angles by swinging the light source, so as to realize far-field laser beam superposition.
However, both the above two modes have the defects that when the DOE element realizes the superposition of the punctiform faculae, the DOE element has limit requirements on the wavelength and the type of the light source; the whole optical system is not compact in structure and the size of the light outlet is large due to the arrangement angle of the light source.
Disclosure of Invention
The invention aims to provide an optical module and a laser module, which can realize different light spots superposition, have less limitation on light sources and have compact structure.
Embodiments of the present invention are implemented as follows:
an embodiment of the invention provides an optical module, which comprises an array lens group and a wedge-shaped lens group, wherein the array lens group and the wedge-shaped lens group are sequentially arranged along a main optical axis, the array lens group comprises a first array lens and a second array lens which are sequentially arranged along a first direction perpendicular to the main optical axis, the wedge-shaped lens group is arranged on a light emitting side of the first array lens and/or the second array lens, laser beams output angular space flat-top light spots with the same divergence angle through the array lens group, and the angular space flat-top light spots form superimposed light spots in an angular space in a far field after being refracted by the wedge-shaped lens group.
Optionally, the focal length and the surface shape of the first array lens and the second array lens are the same.
Optionally, the first array lens and the second array lens are of unitary construction.
Optionally, the wedge-shaped lens group is disposed on the light emitting side of the first array lens or the second array lens, and the wedge-shaped lens group includes a first wedge-shaped lens and a second wedge-shaped lens sequentially connected along the arrangement direction of the array lens group.
Optionally, the wedge-shaped lens group includes a first wedge-shaped lens and a second wedge-shaped lens that are sequentially connected along the arrangement direction of the array lens group, the first wedge-shaped lens corresponds to the light emitting side of the first array lens, and the second wedge-shaped lens corresponds to the light emitting side of the second array lens.
Optionally, the optical lens further comprises a collimating lens arranged along the main optical axis, and the collimating lens is positioned at one side of the array lens group away from the wedge-shaped lens group; the collimator lens further comprises a compression lens arranged on the main optical axis, and the compression lens is positioned between the collimator lens and the array lens group.
Optionally, the optical system further comprises a reflector arranged on the main optical axis, and the reflector is positioned on one side of the array lens group away from the wedge-shaped lens group and used for adjusting the path of light beam propagation.
Optionally, the first array lens and the second array lens are arranged at a preset included angle, and the preset included angle is between 0 and 90 degrees.
Optionally, the wedge angle of the first wedge mirror and the wedge angle of the second wedge mirror are not equal.
Optionally, the first array lens and/or the second array lens are each a cylindrical array lens or a serrated surface array; the array lens group further comprises a third array lens which is arranged between the first array lens and the second array lens, and the incident surface or the emergent surface of the third array lens is a serrated surface or a cylindrical surface.
Optionally, a hyperboloid mirror and a plano-convex mirror are sequentially arranged along the main optical axis direction, the hyperboloid mirror and the plano-convex mirror make the laser beam emergent along the first direction, and the hyperboloid mirror and the plano-convex mirror are both located at one side of the array lens group far away from the wedge-shaped lens group.
In another aspect, an embodiment of the present invention provides an optical module, which includes the optical module, and a first laser light source and a second laser light source arranged along the first direction, where the first laser light source and the second laser light source respectively correspond to a first array lens and a second array lens of the optical module.
The beneficial effects of the embodiment of the invention include:
the optical module and the laser module provided by the embodiment of the invention are characterized in that laser beams emitted by a laser source are emitted sequentially through an array lens group and a wedge-shaped lens group, the array lens group comprises a first array lens and a second array lens which are sequentially arranged along a first direction perpendicular to a main optical axis so as to output angle space flat-top light spots with the same beam angle, the angle space flat-top light spots are refracted through the wedge-shaped lens group so as to adjust the distribution position of the line light spots in the angle space, and superimposed light spots in the angle space are formed in a far field. Through setting up array lens group and wedge mirror group to according to array lens group and the different change combination of wedge mirror group, can form the superimposed facula of different effects, the facula form is diversified, and the flexibility is high, can adapt to different demands, through above-mentioned three optical element, realizes that different facula superposes, optical module compact structure, small in size, with low costs, and the restriction to the light source is few.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical module according to an embodiment of the present invention;
FIG. 2 is a slow axis directional light path diagram of FIG. 1;
FIG. 3 is a fast axis direction light path diagram of FIG. 1;
FIG. 4 is a second schematic diagram of an optical module according to an embodiment of the present invention;
FIG. 5 is a superimposed spot formed in FIG. 4;
FIG. 6 is a third schematic diagram of an optical module according to an embodiment of the invention;
FIG. 7 is a slow axis directional light path diagram of FIG. 6;
FIG. 8 is a fast axis direction light path diagram of FIG. 6;
FIG. 9 is a schematic diagram of an optical module according to an embodiment of the present invention;
FIG. 10 is a slow axis directional light path diagram of FIG. 9;
FIG. 11 is a superimposed spot formed in FIG. 9;
FIG. 12 is a fast axis direction light path diagram of FIG. 9;
FIG. 13 is a schematic diagram of an optical module according to an embodiment of the present invention;
FIG. 14 is a superimposed spot formed in FIG. 13;
FIG. 15 is a schematic diagram of an optical module according to an embodiment of the present invention.
Icon: 100-collimator mirror; 101-a first collimating mirror; 102-a second collimating mirror; 200-a compression mirror; 201-a first compression mirror; 202-a second compression mirror; 300-array lens group; 301-a first array of lenses; 302-a second array lens; 303-a third array lens; 400-wedge-shaped lens group; 401-a first wedge mirror; 402-a second wedge mirror; 500-converging lenses; 600-hyperboloid mirror; 700-plano-convex mirrors; 800-mirrors; 801—a first mirror; 802-a second mirror; 900-accommodating lenses.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
Referring to fig. 1, the present embodiment provides an optical module, which includes an array lens assembly 300 and a wedge-shaped lens assembly 400 sequentially disposed along a main optical axis, the array lens assembly 300 includes a first array lens 301 and a second array lens 302 sequentially disposed along a first direction perpendicular to the main optical axis, the wedge-shaped lens assembly 400 is disposed on an emitting side of the first array lens 301 and/or the second array lens 302, laser beams form angular space flat-top light spots with different beam angles through the array lens assembly 300, and the angular space flat-top light spots form superimposed light spots with an angular space in a far field after being refracted by the wedge-shaped lens assembly 400.
And may further include a collimator lens 100 disposed along the main optical axis, the collimator lens 100 being located on a side of the array lens group 300 remote from the wedge-shaped lens group 400. The collimator lens 100 is used for collimating the laser beam. The laser light source emits a laser beam, which passes through the collimator lens 100, the array lens group 300, and the wedge lens group 400 in this order.
Wherein the collimator lens 100 comprises a fast axis collimator lens, or the collimator lens 100 comprises a fast axis collimator lens and a slow axis collimator lens.
The array lens group 300 includes a first array lens 301 and a second array lens 302 sequentially arranged along a first direction perpendicular to the main optical axis, and the first direction may be parallel to the main optical axis or perpendicular to the main optical axis.
The array directions of the first array lens 301 and the second array lens 302 are the same as the first direction of the main optical axis, and are arrayed along the first direction.
The first array lens 301 and the second array lens 302 may be integrated as shown in fig. 1 to form the array lens group 300, or may be arranged in parallel and symmetrical on both sides of the main optical axis as shown in fig. 4.
As shown in fig. 13, the first array lens 301 and the second array lens 302 may be disposed on both sides of the main optical axis in a staggered manner.
After collimating the laser beam emitted from the laser light source, the collimator lens 100 is incident on the first array lens 301 and the second array lens 302 to output angular space flat-top light spots with different beam angles.
Further, the first array lens 301 and the second array lens 302 are different in surface shape, or the first array lens 301 and the second array lens 302 are different in focal length. The surface type includes spherical surface, aspherical surface, cylindrical surface (including ellipsoidal surface), and saw tooth surface.
The wedge-shaped lens group 400 is disposed on the light emitting side of the first array lens 301 and the second array lens 302, as shown in fig. 4, the wedge-shaped lens group 400 includes a first wedge-shaped lens 401 and a second wedge-shaped lens 402 sequentially connected along the arrangement direction of the array lens group 300, the first wedge-shaped lens 401 corresponds to the light emitting side of the first array lens 301, and the second wedge-shaped lens 402 corresponds to the light emitting side of the second array lens 302.
Alternatively, the wedge-shaped lens group 400 is disposed on the light emitting side of the first array lens 301 or the second array lens 302, and the wedge-shaped lens group 400 includes a first wedge-shaped lens 401 and a second wedge-shaped lens 402 sequentially connected along the arrangement direction of the array lens group 300. As shown in fig. 13, the wedge-shaped lens group 400 is disposed on the light emitting side of one of the two lenses, that is, the wedge-shaped lens group 400 is disposed on the light emitting side of the first array lens 301 or the wedge-shaped lens group 400 is disposed on the light emitting side of the second array lens 302.
The wedge-shaped lens group 400 is used for refracting angle space flat-top light spots with different beam angles formed by the array lens group 300, and then, after passing through the emergent surface of the wedge-shaped lens group 400, overlapping light spots with angle space are formed in a far field.
The energy distribution of the superimposed light spots is three sections, namely a low-energy flat-top distribution on two sides and a high-energy flat-top distribution in the middle; or can also realize complete superposition and superposition to form a complete flat-top energy distribution with equal light intensity; or the two ends can be spliced and not overlapped to form a complete flat-top energy distribution with equal light intensity.
In addition, as shown in fig. 1, a compression mirror 200 may be further disposed between the collimator lens 100 and the array lens group 300, and the compression mirror 200 is further disposed on the main optical axis. The compression mirror 200 is used for fine adjustment of the optical path, and corresponds to the first direction and the second direction of the laser beam, for example, the collimating mirror 100 collimates and emits the laser beam along the second direction, and the compression mirror 200 compresses and emits the laser beam along the first direction, and the first direction is perpendicular to the second direction.
Further, when the collimator lens 100 is the fast axis collimator lens 100, the first direction is the slow axis direction, the second direction is the fast axis direction, and the compression lens 200 is the slow axis compression lens 200, the first array lens 301 and the second array lens 302 are symmetrically arranged along the slow axis direction perpendicular to the main optical axis, and the array directions of the first array lens 301 and the second array lens 302 are all arranged along the slow axis direction, so that the light emitting effect is better.
Of course, the first direction may be the fast axis direction, and the second direction may be the slow axis direction, and the arrangement of the optical elements is correspondingly matched and changed.
As shown in fig. 2, the first direction is a light path diagram of the slow axis, so as to form the superimposed light spot shown in fig. 5. When the first direction is the fast axis, the light path diagram is shown in fig. 3.
In addition, the collimator lens 100 includes a first collimator lens 101 and a second collimator lens 102, where the first collimator lens 101 and the second collimator lens 102 collimate and emit laser beams along a second direction; and/or, the compression mirror 200 comprises a first compression mirror 201 and a second compression mirror 202, and the first compression mirror 201 and the second compression mirror 202 compress and emit laser beams along a first direction.
One of the cases is: the collimating mirror 100 and the compressing mirror 200 may include two lenses, respectively, as shown in fig. 4, and the collimating mirror 100 includes a first collimating mirror 101 and a second collimating mirror 102, where the first collimating mirror 101 and the second collimating mirror 102 collimate and emit the laser beam along the second direction.
The compression mirror 200 includes a first compression mirror 201 and a second compression mirror 202, and the first compression mirror 201 and the second compression mirror 202 compress and emit laser beams along a first direction.
When the collimator lens 100 is divided into two lenses, i.e. includes the first collimator lens 101 and the second collimator lens 102, correspondingly, there may be two laser light sources, which are respectively located on the incident surfaces of the first collimator lens 101 and the second collimator lens 102, so as to respectively emit laser beams to the first collimator lens 101 and the second collimator lens 102.
In this way, the first collimating mirror 101 and the second collimating mirror 102 may be connected or staggered, so as to form different light spot superposition effects.
The second case is: the collimator lens 100 includes a first collimator lens 101 and a second collimator lens 102, and the compression lens 200 is one (not shown in the figure).
The third case is: as shown in fig. 6, the collimator lens 100 is one, and the compression lens 200 includes a first compression lens 201 and a second compression lens 202.
According to the optical module provided by the embodiment of the invention, laser beams emitted by a laser source are emitted sequentially through the collimating lens 100, the array lens group 300 and the wedge-shaped lens group 400, the collimating lens 100 collimates the laser beams, the array lens group 300 comprises the first array lens 301 and the second array lens 302 which are sequentially arranged along the first direction perpendicular to the main optical axis, the surface types and focal lengths of the first array lens 301 and the second array lens 302 are different, so that angular space flat-top light spots with different beam angles are output, the angular space flat-top light spots are refracted through the wedge-shaped lens group 400, the distribution position of line light spots in the angular space is adjusted, and superimposed light spots in the angular space are formed in a far field. Through setting up array lens group 300 and wedge group 400 to according to array lens group 300 and the different change combination of wedge group 400, can form the superimposed facula of different effects, the facula form is diversified, and the flexibility is high, can adapt to different demands, through above-mentioned three optical element, realizes different facula stack, optical module compact structure, small in size, with low costs, and the restriction to the light source is few.
As shown in fig. 13, when the wedge-shaped lens group 400 is disposed on the light-emitting side of the first array lens 301 or the second array lens 302, the wedge-shaped lens group 400 includes a first wedge-shaped lens 401 and a second wedge-shaped lens 402 sequentially connected along the arrangement direction of the array lens group 300.
The first wedge mirror 401 and the second wedge mirror 402 are sequentially connected along the arrangement direction of the array lens group 300, and the first wedge mirror 401 and the second wedge mirror 402 may be integrated. Wedge lens group 400 refracts only the corresponding array lens.
As shown in fig. 13, which is an optical path diagram in the slow axis direction, two laser light sources are provided and are respectively located on the incident surfaces of the first collimating mirror 101 and the second collimating mirror 102, and one path of laser light beam emits light spots through the first collimating mirror 101, the first compressing mirror 201, the first array lens 301 and the wedge-shaped lens group 400; the other laser beam is emitted to form a facula through the second collimating mirror 102, the second compressing mirror 202 and the second array lens 302, and the two laser beams finally form a superimposed facula in the far field.
Wherein the curvatures of the first array lens 301 and the second array lens 302 are different, so that the distribution of the linear light spots forms angular space dislocation. The wedge lens group 400 is only used for shaping the beam splitting of the first array lens 301, and cutting the light spot into two parts, wherein one part is overlapped with the light spot part emitted by the second array lens 302.
Further, the optical system further includes a mirror 800 disposed on the main optical axis, where the mirror 800 is located on a side of the array lens group 300 away from the wedge-shaped lens group 400, for adjusting a path of light beam propagation, where the path of light beam propagation includes, but is not limited to, modification of a light beam propagation direction, or translation of the light beam in a direction parallel to the optical axis, or conversion of a laser fast axis and a laser slow axis, specifically, conversion of a divergence angle of the fast axis and the slow axis.
Illustratively, the mirror 800 is positioned between the second compression mirror 202 and the second array lens 302.
As shown in fig. 13 and 15, when the two light sources are arranged in a staggered manner or the arrangement angle of the two light sources can be changed, the direction of the light path is changed by the reflector 800, so that the laser beam emitted by the light source enters the second array lens 302 after passing through the reflector 800. Fig. 14 is a far field distribution of spots corresponding to fig. 13, showing three separate linear spots and their energy distribution.
The number and the arrangement positions of the reflecting mirrors 800 are not limited, and the first reflecting mirror 801 and the second reflecting mirror 802 are arranged in fig. 13, and the two reflecting mirrors 800 are arranged in fig. 15, specifically, the arrangement is adjusted according to the direction of the optical path, so that the laser beam emitted from the light source can be incident on the second array lens 302 through the reflecting mirror 800 after passing through the second collimating mirror 102 and the second compressing mirror 202.
An adjusting lens 900 may be further disposed between the reflecting mirror 800 and the second array lens 302, and the laser beam is adjusted to be incident on the second array lens 302.
When the wedge mirrors 401 and the second wedge mirror 402 are disposed on the light emitting sides of the first wedge mirror 401 and the second wedge mirror 402, as shown in fig. 4, the wedge mirror group 400 may include the first wedge mirror 401 and the second wedge mirror 402 sequentially connected along the arrangement direction of the array lens group 300, the first wedge mirror 401 corresponds to the light emitting side of the first array lens 301, refracts the laser beam passing through the first array lens 301, and the second wedge mirror 402 corresponds to the light emitting side of the second array lens 302, refracts the laser beam passing through the second array lens 302.
The wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 may be equal or unequal. When equal, the refraction angles are the same; when the two laser beams are not equal, the refraction angles are different, so that the emergent laser beams form different superposition effects.
Illustratively, as shown in FIG. 2, the wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 are not equal, i.e., the slope of the wedge-face of the first wedge mirror 401 and the slope of the wedge-face of the second wedge mirror 402 are not equal. Fig. 7 shows a state in which the wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 are equal.
The wedge angle of the first wedge mirror 401 and the wedge angle of the second wedge mirror 402 are placed opposite, or facing away.
When placed back to back, the first wedge mirror 401 and the second wedge mirror 402 may be integrated, or the first wedge mirror 401 and the second wedge mirror 402 are two separate pieces, or a sheet glass is added between the first wedge mirror 401 and the second wedge mirror 402 as a transition.
As shown in fig. 6 and 7, the first array lens 301 and the second array lens 302 are disposed at a predetermined angle, and the predetermined angle is between 0 ° and 90 °.
That is, the first array lens 301 and the second array lens 302 have an included angle with the main optical axis, so that the first array lens 301 and the second array lens 302 are disposed at a predetermined included angle. The angle between the first array lens 301 and the main optical axis and the angle between the second array lens 302 and the main optical axis may be equal or unequal. The laser beams passing through the array lens group 300 are further formed into angular space flat-top light spots with different beam angles, so that the light spot superposition effect is diversified.
A condensing lens 500 for condensing the laser beam emitted from the compression mirror 200 may be further provided between the compression mirror 200 and the array lens group 300.
When the first direction is the slow axis, the optical path diagram is shown in fig. 7, and fig. 8 is the fast axis direction optical path diagram.
In addition, the first array lens 301 and/or the second array lens 302 are each a cylindrical array lens or a saw tooth surface array.
Further, as shown in fig. 9 and 10, the first array lens 301 and the second array lens 302 may be biconvex array lenses, and in this case, the array lens group 300 may further include a third array lens 303 disposed between the first array lens 301 and the second array lens 302, and an incident surface or an exit surface of the third array lens 303 is a saw tooth surface, and an array direction of the saw tooth surface is the same as that of the first array lens 301. The incident surface or the exit surface of the third array lens 303 may also be a cylindrical surface. Wherein the curvatures of the first array lens 301 and the second array lens 302 are the same, and the curvatures of the third array lens 303 and the first array lens 301 and the second array lens 302 are different.
The biconvex array lenses of the first array lens 301 and the second array lens 302 are used to form a linear flat angle distribution in an angular space, dividing the laser beam according to the tooth surface slope of the serrations and the arrangement density of the serrations.
Illustratively, the angular area occupied by each of the zigzag array lenses of the third array lens 303 located in the middle is <0.1 °, and the laser beam is subjected to area division of 0.1 ° and deflection, so as to realize lattice distribution in angular space.
The hyperboloid mirror 600 and the plano-convex mirror 700 are sequentially arranged along the main optical axis direction, the hyperboloid mirror 600 and the plano-convex mirror 700 are both positioned on one side of the array lens group 300 away from the wedge-shaped lens group 400, specifically, the hyperboloid mirror 600 and the plano-convex mirror 700 are sequentially arranged between the collimating mirror 100 and the array lens group 300, and the hyperboloid mirror 600 and the plano-convex mirror 700 both enable laser beams to exit along the first direction.
Illustratively, as shown in fig. 10, when the first direction is the slow axis, i.e., the hyperboloid mirror 600 is the slow axis hyperboloid mirror 600, and the plano-convex mirror 700 is the slow axis plano-convex mirror 700, the superimposed spot shown in fig. 11 is formed. Of course, the first direction may be the fast axis, and fig. 12 is an optical path diagram of the fast axis direction.
As shown in fig. 10, the laser light source emits a laser beam, the laser beam is collimated by the fast axis collimator lens 100, and is emitted to the slow axis plano-convex lens 700 by the slow axis hyperboloid lens 600, wherein the slow axis hyperboloid lens 600 has a gaussian conversion top function on the laser light source, the slow axis plano-convex lens 700 collimates the laser beam, and the collimated laser beam enters the array lens group 300.
The array lens group 300 comprises a first array lens 301, a second array lens 302 and a third array lens 303, wherein the first array lens 301 and the second array lens 302 are respectively positioned at two sides of a main optical axis and are composed of biconvex micro units, and laser beams entering the first array lens 301 and the second array lens 302 are focused on the second convexity after passing through the first convexity, so that uniform light spots can be formed; the third array lens 303 is a saw-tooth array lens, and functions to perform small-angle differentiation and cutting deflection on the laser beam; the first array lens 301 and the second array lens 302 may have the same or different surface shapes and focal lengths (i.e., the same or different laser beam output divergence angles).
After entering the array lens group 300, the collimated laser beams are subjected to three parts, wherein the upper part and the lower part correspond to the first array lens 301 and the second array lens 302, and a flat-top light field under an angular space forming a certain divergence angle is output; the saw-tooth array lens (third array lens 303) located at the middle part divides the laser beam into one part of laser beams at a minute angle and deflects the laser beams to form uniform point-like distribution in the angular space. The three laser beams passing through the array lens group 300, the laser beams emitted by the first array lens 301 and the second array lens 302, and the corresponding first wedge-shaped mirror 401 and second wedge-shaped mirror 402 deflect the laser beam light field in opposite directions, and the spot light field light spots emitted by the third array lens 303 in the middle are directly output, so that the combined light field with the line light spots at both sides and the spot light at the middle in fig. 11 is finally formed, namely, the combined light field with the point light spots in the middle is overlapped and output.
In summary, the optical module provided in this embodiment, through setting up the array lens group 300 and the wedge-shaped lens group 400 to according to the different variation combinations of array lens group 300 and wedge-shaped lens group 400, can form the superimposed facula of different effects, the facula form is diversified, and the flexibility is high, adaptable different demands, and optical module compact structure, small in size, with low costs.
The present embodiment further provides a laser module, including the above optical module, and a first laser light source and a second laser light source arranged along a first direction, where the first laser light source and the second laser light source respectively correspond to a first array lens 301 and a second array lens 302 of the optical module.
As shown in fig. 13, two laser light sources are provided and are respectively located on the incident surfaces of the first collimating mirror 101 and the second collimating mirror 102, and the first laser light source emits light spots through the first collimating mirror 101, the first compressing mirror 201, the first array lens 301 and the wedge-shaped mirror group 400; the second laser source emits light spots through the second collimating mirror 102, the second compressing mirror 202 and the second array lens 302, and the two paths of laser beams finally form superimposed light spots in the far field.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. The utility model provides an optical module, its characterized in that includes array lens group and wedge lens group that sets gradually along the main optical axis, array lens group includes first array lens and the second array lens that sets gradually along the first direction of perpendicular to main optical axis direction, wedge lens group set up in first array lens and/or the play light side of second array lens, laser beam passes through array lens group output divergence angle the same angle space flat-top facula, angle space flat-top facula is through wedge lens group refraction back forms the superimposed facula in angle space in the far field.
2. The optical module of claim 1, wherein the first array lens and the second array lens have the same focal length and surface shape.
3. The optical module of claim 1, wherein the first array of lenses and the second array of lenses are of unitary construction.
4. The optical module of claim 1, wherein the wedge-shaped lens group is disposed on a light-emitting side of the first array lens or the second array lens, and the wedge-shaped lens group comprises a first wedge-shaped lens and a second wedge-shaped lens sequentially connected along a direction in which the array lens group is disposed.
5. The optical module of claim 1, wherein the wedge lens group is disposed on the light emitting sides of the first array lens and the second array lens, the wedge lens group comprises a first wedge lens and a second wedge lens sequentially connected along the arrangement direction of the array lens group, the first wedge lens corresponds to the light emitting side of the first array lens, and the second wedge lens corresponds to the light emitting side of the second array lens.
6. The optical module of any one of claims 1-5, further comprising a collimating lens disposed along the primary optical axis, the collimating lens being located on a side of the array lens group remote from the wedge-shaped lens group; the collimator lens further comprises a compression lens arranged on the main optical axis, and the compression lens is positioned between the collimator lens and the array lens group.
7. The optical module of any one of claims 1-5, further comprising a mirror disposed on the primary optical axis, the mirror being located on a side of the array lens group remote from the wedge-shaped lens group for adjusting a path of light beam propagation.
8. The optical module of claim 1, wherein the first array of lenses and the second array of lenses are disposed at a predetermined angle, the predetermined angle being between 0 ° and 90 °.
9. The optical module of claim 4 or 5, wherein the wedge angle of the first wedge mirror and the wedge angle of the second wedge mirror are unequal.
10. The optical module of any one of claims 1-5, wherein the first array lens and/or the second array lens are each a cylindrical array lens or a saw tooth face array; the array lens group further comprises a third array lens which is arranged between the first array lens and the second array lens, and the incident surface or the emergent surface of the third array lens is a serrated surface or a cylindrical surface.
11. The optical module of claim 10, wherein a hyperboloid mirror and a plano-convex mirror are sequentially arranged along the main optical axis direction, the hyperboloid mirror and the plano-convex mirror both enable the laser beam to exit along the first direction, and the hyperboloid mirror and the plano-convex mirror are both located on one side of the array lens group away from the wedge lens group.
12. A laser module comprising the optical module of any one of claims 1-11, and first and second laser light sources arranged along the first direction, the first and second laser light sources corresponding to the first and second array lenses of the optical module, respectively.
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| CN112904581A (en) * | 2021-02-05 | 2021-06-04 | 西安炬光科技股份有限公司 | Laser module, device, optical space conversion method and medium-intensity light spot forming method |
| CN114253000A (en) * | 2021-07-13 | 2022-03-29 | 西安炬光科技股份有限公司 | Optical module and laser system |
| CN113740869A (en) * | 2021-08-30 | 2021-12-03 | 杭州洛微科技有限公司 | Transmitting module and laser radar |
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| CN115268094A (en) | 2022-11-01 |
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